Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 219,857	$ 178,946
Accounts receivable, net of allowance of $14,037 and $13,683, at March 31, 2019 and December 31, 2018, respectively	204,795	206,772
Prepaid expenses	22,097	19,970
Income tax receivable	17,628	18,817
Deferred financing costs, net	564	564
Other current assets	249	240
Total current assets	465,190	425,309
Property and equipment, net	90,294	94,435
Goodwill	487,617	487,617
Intangible assets, net	64,801	67,140
Operating lease right-of-use assets	20,110
Deferred financing costs, net	1,532	1,673
Other assets	3,110	2,344
Total assets	1,132,654	1,078,518
Current liabilities:
Accounts payable, accrued expenses and other liabilities	63,078	74,902
Estimated liability for appeals	24,043	21,723
Total current liabilities	87,121	96,625
Long-term liabilities:
Revolving credit facility	240,000	240,000
Operating lease liabilities	18,677
Net deferred tax liabilities	19,710	18,485
Other liabilities	6,758	10,012
Total long-term liabilities	285,145	268,497
Total liabilities	372,266	365,122
Commitments and contingencies
Shareholders' equity:
Preferred stock -- $0.01 par value; 5,000,000 shares authorized; none issued	0	0
Common stock -- $0.01 par value; 175,000,000 shares authorized; 100,745,077 shares issued and 87,081,712 shares outstanding at March 31, 2019; 98,924,501 shares issued and 85,261,664 shares outstanding at December 31, 2018;	1,007	989
Capital in excess of par value	453,080	425,748
Retained earnings	441,877	422,235
Treasury stock, at cost: 13,663,194 shares at March 31, 2019 and 13,663,194 shares at December 31, 2018	(135,576)	(135,576)
Total shareholders' equity	760,388	713,396
Total liabilities and shareholders' equity	$ 1,132,654	$ 1,078,518